Ozone generator



| s. cHADwlcK 2,607,726

ozoNE GENERATOR 5, 1949 2 sr'iEE'rs-SHEET 1 Filed Jan.

IIIIIIIIIIIIIIIIII IH www n mvENroR. 6E-5, Cyaan/mf( yPatented Aug. 19, 1952 OZONE GENERATOR Lee S. Chadwick, Shaker Heights, Ohio, assigner to Perfection Stove Company, Cleveland, Ohio, a corporation of Ohio Original application June 30, 1945, Serial No. 602,596. Divided-and this application January v5, 1949, Serial No. `69,332

This application is a division of oneV filed June 30, 1945, entitled Apparatus for Producing Vaporous Ozonides, Serial No. 602,596, nowPatent No. 2,529,137, the present case having reference to the ozone generator incorporated in the apparatus of said patent.

An object of the instant invention is the production of a highly eflicient and durable ozone generator of such simple construction that assembly, disassembly, and replacement of parts, when necessary, are greatly facilitated and re.- quire the minimum of time, the parts desirably interlocking in such fashion that they are held in assembled condition by a single fastening means.

Another and. more specific object of the invention is to provide a construction by which the heat generating and/or heat absorbing parts of the ozone generator, ,such as the electrodes and dielectric, are kept at relatively low temperatures in order to preserve them against-l deterioration and prevent damage thereto and thus prolong their periods of usefulness, andv this is accomplished by including means for yadmitting a volume of atmospheric air or other relatively cool gas to the ozone generator in excess of -that which is'to be ozonized, and conducting all of the air or gas in intimate heat exchanging relation to lthe aforesaid part or par-ts, the excess, over and above that ozonized, beingvented to the atmosphere.

A further object is to include in the ozone generator, means for controlling the supply of -air or other gas that is to be used for vaporizing purposes (and, more particularly, when atmospheric air constitutes suchV gas, for automatically stabilizing its temperature regardless of fluctuations in temperature of theatmosphere) so as to contribute to the production of a mixture of uniform proportions. 'This is accomplished in the present embodiment of the invention by means of a thermostatic control that is incorporated in the generator, and which properly apportions heated air and fresh yatmospheric air in the production of'v an air supply of the desired temperature for vaporizing purposes.

vThese objects and advantages, with others hereinafter appearing, are attained in the vem,- bodiment of the inventionl illustrated in the accompanying drawings, wherein Fig. 1 'is @a sectional side elev-ation of an apparatus incorporating my improved ozone generator, the section-,being in voffset planes, as indicated by the line I l of Fig. 2, `and passing centrally throughthe generator; Fig. 2 is a plan viewof theapparatuswi-th parts broken away, -and'Fig- 3 is a fragmentary 13 Claims. (Cl. 204-321) elevational view as though looking from the'left of Figs. land 2, the sectional portion of the view being in a plane indicated bythe line 3-3 of Fig. 2.

Like reference characters designate like parts in the different views o f the drawings.

Starting with la rather general description of the apparatus incorporating the ozone `generator of the present invention, I denotes a base desirably constructed of sheet metal and having an upstanding peripheral iiange 2. Rising from the base along a part of one side thereof is a panel 3 that is attached, Vby screws 4, to the Aflange 2. 5 is an electrical transformer of conventional design that is attached to the top portion of the panel 3 by suitable fastening means, including bolts 6; and mounted on the base below the transformer is an air impeller o r centrifugal blower ',l, the fan of which (not shown) is driven by an electric motor 8.

'Fastened by screws I0 to the panel 3 is the rectangular housing I I vof an air conditioning unitin the present instance, an air drier or dehydrator. For a more detailed description of the s,an 1e 1eference may be made to the above. application of which this is a division. The inclusion of this air conditioning unit is optional. The housing II has an air inlet, designated I2 in Fig. 1, thatlis placed in communicative connection with the outlet of the air imp eller or blower 1 through av conduit I3v (Fig. 2).A 0n its side opposite the panel 3, and near its upper end, the housing Il is provided with an air outlet I4.

An evaporating tank l5 is supported from the base i bya stand I6. This evaporating tank the nature of a pan, closed atthe top by a cover ll. A volatile liquid, such, vfor example, as pinene, is supplied to the evaporating tank from 'a dispensing receptacle 20. This receptacle Amay consist of a glass bottle that rests in an inverted position within a `suitable holder that surmounts the cover Il of the evaporating tank so that the neck of the vbottle depends through an opening in the cover and in such manner that the dischargemouth of thereceptacle or bottle will be liquid sealed 4within the tank, thereby to maintain, `'by the well-known barometric principle, a substantially constant liquid level in the tank at about the elevation indicated by the broken line a in Fig. 1. 'This construction is disclosed in detail in the Ibeforementioned application. Bailles 2| and Y22, that extend from the cover Il to well below the liquid vlevel in the tank, provide a tor-tuous ycourse -for the vaporizing gas, as will'be seen by reference tothe iaforesaid* application, as

fully appear hereinafter, ozone is delivered to the A mixing chamber from the ozone generator andr commingles with the vapors in said chamben/the resultant vaporous ozonide being discharged-- through an outlet opening 28 in the top wall of the chamber, shown in Fig. 2i aszsurrounded by a flanged collar 29.

way from a suitable source through condu-ctors (not shown) to the electric motor 8, andto the f primary coil of the transformer 5.

',Surmounting the evaporating tank l5 and'located alongside the mixing chamber 2-5 isvv the ozone generator designated generally by the lref-` erence numeral 30, and which I shall nowlde-v scribe in detail. Locked within-anaperture of the cover llof the. evaporating tank is an internally threaded boss 3| into which is screwed thelower threaded end. of a hollow column 32 about which the. parts oftheozone generator are assembled. It may be mentionedinpassing, although it will be more fully explained hereinafter, thatgasor air is delivered` to the evaporating tankthrough the column 32A.

Surrounding the lower end of the column 32 Electrical current may be suppliedin the usual is a 4circular bottom unit 33having an annular formedI on the inner sides of said walls adjacent their upper. edges `areannular seats wherewith are engaged the lower ends of the inner-and outer vcylindrical casing walls 40 and lll, respectively. These casing walls are made of suitable metal and are provided a short distance above their vlower ends with series of vent apertures,.those of the respective inner and outer walls being designated a and Ma. Applied to the top of the inner wall 40 isa circular partition.43,.having openings 43B, the partition being properly positioned with respect to said wall by a depending flange 44. A cross pin 45 is extended through diametrically opposed holes in the column 32 and has its ends conned within a central depression of the partition 43 and with the partition thus held down, it serves to retain the wall 40 with its lower vend rmly engaged with the seatupon which it bears.

Fitted over -the top of the outer -cylindrical wall 4l is a flanged rim of a two-partcap or top unit 50, the partsY whereof separate in substantially the central horizontal plane of the unit; The mating' edges of the two parts are formed with intertting flanges' to more effectively'close the joint between said partsj" Projecting through' a central aperture in the circular top wall 5l of the unit 50 is the threaded upper end of the column 32,' and applied to said end is'a screw 'cap 53 that bears' against said wall andy presses the entire assemblyA surrounding'the :two electrodes, a dielectric 60.

column downwardly against the cover l1 of the evaporating tank I3.

Disposed between the inner and outer cylindrical casing walls 40 and I in substantially concentric spaced relation thereto and to one another'jare inner and' outer tubular relectrodes 55 "and 56, respectively, and, intermediate the According to my present preference, stainless steel is used for theelectrodes, and boro-silicate glass, generally known by the .trade name Pyrex, for the dielectric. rIheelectrodes bear at their lower 4`,endson a`.plurality of lugs 6l that are spaced apart about the channel 36 and are carried by ftheeinn'e'yr' andv outer walls thereof, the upper ends off said lugs being notched to provide seats for the electrodes. vThe dielectric extends a sub- 1 stantial. distance below Vthe lower ends of the electrodes and is shownY as yieldingly supported by a suitable number fv resilientclips 63 that aredistributed aboutthe channel 35 and rest on the bottom wall thereof and serve to sustain the dielectric substantially'equally spaced from the two electrodes. l

A header B5, in the form ofa downwardly opening annular channel, is` applied to the upper ends ofthe electrodes and dielectric. The outer electrode 5B is ilared adjacent its upper end and seats within the rabbeted lower .edge of the outer,v

wall of the header 65, while the upper end of the inner electrode is contracted and seats within the rabbeted lower edge of the inner wall of the header. The dielectric extends well above the tops of the electrodes and is yieldingly located substantially centrally within the channel of the headerfby a series' of resilient clips 58. The header is provided with alateral outlet extension 1D that projects through an aperture that is divided between the two parts of the top unit 540 and is approximately aligned with a neck 'H that surrounds the ozone inlet opening of the mixing chamber 25. A gas-tight joint between said extension 'Il and the neck 'i0 is made by a coupling 130i suitable resilient material. The ends of the coupling'after being stretched over the circumferentially beaded ends of the extension and neck, contract and snugly nt about said parts. p The header 65 is spaced from the top wall 5I of the unit'50 byl lugs 15 on the'header, and from the peripheral wall of said'runit yby lugs 'H5v vthat exten'dminwar'dly from the last mentioned wall.

Air or gas is admitted to the casing -ofthe ozone generator from the housing Il of the air conditioning u nitl through a relatively large opening in the outer casing wall 4l. The ilared end of a fitting 8l iswelded or otherwise secured to said wall 4| about the opening 80, while its end remote from said wall is provided with an opening surrounded by a flange 82 into which a flange surrounding the outlet Ill of the housing Il snugly fits.

It mayY be explained, though not illustrated, that one terminal of the secondary'winding of the transformer I0 is grounded. vThe other terminal, represented by a binding post 83,-is electrically connected, through a conductor 85, with the inner electrode 55 of the ozone generator, said conductor entering the casing of the generator through a hole 86 in the top wall of the unit= 5l). The outer electrode 56 is grounded throughY a spring finger 8l' of suitable metal that is carried by the outer casing wall 4l and bears v against said electrode.

is Ienclosed by the inner casing wall 40, the bottom unit 33 and the previously mentioned partition'43, intoa cool Iair chamber 9| and a'warm air chamber S2; lThe interior of the hollow column-32 communicateswith the cool air chamber Si through a port 93 in the wall of said column, and Awith the'warm air chamber' SZfthrough a port 94. `A thermostatic element 95, in the form of Ia biLmet-al strip, is carried lby a bar 96 that extends across and is supportedlby the column. Valves o'r shuttersfll and 93 are carried'b'y the bi-metal stripvnea'r the' free end vthereofl and are arranged to cooperate withthe 'respectiveports 93 and 94. Under the inuence of- `abnormally cool air, the'bi-metal strip warps in a 'direction to move the .Valve or shutter 97 toward theport 93, and, under the in'uence of warmair, in a direction to move thevalve or shutterfSS toward theportSLl. L

In'operation, with electric current supplied. to the motor B and transformer '5,' air will be delivered by 'the impeller or blower 1, through the housing Il, to 'the interior of the ozone genera; tor casing, the air entering said casingr through the opening 8. A part of the air flows upwardly within the annular space between the outer case ing wall il and the adjacent electrode 56 and nds its rway about the" header 55, located'within and spaced from the walls' of the top unit 50, the air continuing downwardly between the inner casing wall 45 andthe adjacent electrode 55. Some of this air enters the cool air chamber illV through the openings 43a in the partition 43. The remainder of the air enteringfthroughthe opening' 86 descends within the annularspace rst abovementioned Aandkflows into the channel 36 of the bottom unit 33 and thence through the ozone generating vspace between lthe outer electrode 5B and the dielectric 6U. Some of this downwardly owing air may passv around the lowerend of the dielectric and .loin the air descending Ibetween the inner electrode 55 and the adjacent casing wall 4l) to ascend therewith through the ozone generating space between the inner electrode and the dielectric, generated in the spaces on opposite sidesfof the dielectric 6i) is collected within the header' from which it passes through the extension 1!) and neck 'H into the mixing chamber 25..

Attention is called to the fact that all air admitted to the'apparatus entiers the ozone generator casing. All of this air, or, in any case, lavery large .percentage of it, serves to cool'fthe' heat generating and heatabsorbing parts of the apparatus,` particularly the electrodes 55 and 5S f,

andthe dielectric El). A part of the air,` after serving such purpose, escapes to the atmosphere, as will be more yfully explained hereinafter. Another part continues on through the ozone generating spaces, and is ozonized and delivered to the mixing chamber, as set out above, while the remainder is conducted to the eva'porating tank for producing vapors from the volatile liquid therein and, laden with said vapors, passes on to the mixing lchamber where it joins the before` mentioned ozonized air, the two parts now under consideration being thoroughly intermingled in said chamber and discharged therefrom through the opening 28.

It is important that la proper bal-ance be maintained between the main constituents of the vaporous ozonide, and while this' may be accomplished in large measure by providing passages of predetermined capacity for the'ozone and vapors, I promote the desired end, according to the The ozone r hereindisclosed embodiment of the invention',by employing the beforementioned thermostatic means comprising the bimetal strip andithe valves 0r shutters 91 and 98. In considering the manner in which this' `automatic control functions, it will be assumed that the atmospheric temperature is low and that the air entering-the ozone generator through theopening 80 istoo coldfto properly Vaporize the liquid in'the' evap orating tank I5. The-air entering theV cool'fair chamber 9| through the openings E3aLv passesiinto the hollow'column' 32f through the port .93"and strikes the yloi-metal strip 95.- The resultant-chile ling of the strip causes it towan'p in the'directio'n to present the valve or lshutter 97 to' the 'porti93 and 'wholly or partially close the'portLf In the meantime, `air passing downwardly'betweenfthe inner casing wall 40 and the adjacent "electrode 55 is heated and apart of it enters the warm air chamber 92 through theapertures Ima. Some of this warm Aair passes through the port 94 into the hollow column 32 and is conducted thereby into the evaporating tank 1i), such air being' warm enough to vaporizethe liquid and, with the' vapors, passes' on to the mixing chamber. Air admitted to the chamber 92 in excess' of that de# livered tothe evaporating tank escapesto the atmospherethrough openings 33a of the bottom unit 33.

Under ycontinued operation of the apparatus, the air that enters thelwarm air chamber-*92 might become heated'to' such ade'gree that unless'its temperature Weremoderated itwould produce an over-amount of Vapor, causing a pre'- ponderance of the'pinene or other treatment in the nal product. This is avoided =by response of the thermostatic means to the overly warm air, the fbi-meta1 strip 95 now warping in the reverse direction to that before mentioned, thus opening the port 93 to admit cool air to the co1- umn. This cool air, mixing with the'heated'air, provides a suplply to the 'evaporating tank l5fof a temperature to generate the properamountof Vapor. Any rise in the atmospheric temperature will result inthe lbi-metal strip warping further inthe present direction to close or partially close the port 94 and'shut down the supply of heated an'. v

Aspreviously explained, the inclusion of the air conditioning unit comprising the housing ll is optional. When'said unit is omittedpdirect communicative connections are made between the airvimpeller' or fblor'wer 'I and the opening-oi the fitting 8|, as fully disclosed' in the parent application.

Having thus described my invention, what I claim is: f

1. An ozone generator structure comprising an inner tubular electrode, an outer tubular electrode, and an interposed tubular dielectric, all arranged in substantially concentric, spaced rela# tion to one another, an outer wall surrounding and slightly spaced from the outer Yelectrodefav tubular inner wan similarly spaced from' the' inner electrode, a header to which the' upper ends of the electrodes are joined and into which the vupper end 1 ofy the dielectric projects, the header enclosing an ozone passage into which the spaces on the opposite sides of the dielectric openfa hollow bottom unit to which the lower ends of the 'aforesaid walls are joined and within which are disposedthe lower ends of theelectrodes and the dielectric, the unit comprisin'g'an enclosing wall from which the lower ends oflthe electrodes are spaced, thereby to provide 'by reason of such spacing communication between the spaces on the opposite sides of eachl electrode, a cap enclosing and spaced fromv the header and having its lower end joined to the aforesaid outer wall, and means for admitting gas to the space enclosed by the outer wall and cap.

2. An ozone generator structure comprising a hollow column, an inner tubular electrode, an outer tubular electrode, and an interposed tubular dielectric, all arranged in substantially concentric, spaced relation vto one another and to said column, an outer wall surrounding and slightly spaced from the outer electrode, an inner wall surrounding the column and similarly spaced from the inner electrode, a partition ex- .tending -between said inner wall and the column,

the column being apertured to provide communication between the interior of the column and the spaced above said partition, a header to which the upper ends of the electrodes are Y joined and into which the upper end of the dielectric projects, the header enclosing an ozone passage communicating with the spaces on the opposite sides of the dielectric, a hollow bottom unit surrounding the base of the aforesaid column and to which the lower ends of the aforesaid walls are joined and within which are disposed the lower ends of the electrodes and the dielectric, the unit comprising an enclosing wall from which the lower ends of the electrodes are spaced, thereby to provide by reason of such spacing communication between the spaces on the oppositesides of each electrode, a cap enclosing and spaced from the header and having its lower end joined to the aforesaid outer wall, means securing said cap to the top of the column, and means for admitting gas to the space enclosed by the outer wall and cap.

3. An ozone generator structure according to claim 2,'wherein the outer wall is apertured for venting purposes adjacent its lower end.

4 An ozone generator structure according to claim 2, wherein the inner wall is apertured for venting purposes adjacent its lower end, and said bottom unit is apertured for like purposes.

5. An ozone generator structure comprising a hollow column, an inner tubular electrode, an outer tubular electrode, and an interposed tubular dielectric, all arranged in substantially concentric, spaced relation to one another and to said column, an outer wall surrounding and slightly spaced from the outer electrode, an inner wall surrounding the column and similarly spaced from the inner electrode, an apertured partition extending between `the top of said inner Wall and the column, the column having an opening below said partition, a header to which the upper ends of the electrodes are joined and into which the upper end of the dielectric projects, the header enclosing an ozone passage into which the spaces on ythe opposite sides of the dielectric open, a bottom unit surrounding the base of the aforesaid column and to which the lower ends of the aforesaid walls are joined and within which are disposed the lower ends of the electrodes and the dielectric, the unit comprising an enclosing wall from which the lower ends of the electrodesv are spaced, thereby to provide Iby reason of such spacing communication between the spaces on the'opposite sides of each electrode, a cap enclosing and spaced from the header and having its lower end joined to the aforesaid outer wall, means securing said cap to the top of the column, and means for 8 admitting gas to the space enclosed by the outer wall and cap.

6. An ozone generator structure comprising a hollow vertically disposed column, an inner tubular electrode, an outer tubular electrode, and an interposed tubular dielectric, said electrodes and dielectric surrounding the column and being arranged in substantially concentric spaced relation to one another and to said column, an outer wall surrounding and slightly spaced from the outer electrode, an inner wall similarly spaced from the inner electrode, a header to which the upper ends of the electrodes are joined and into which the upper end of the dielectric projects, the header enclosing an ozone passage into which the spaces on the opposite sides lof the dielectric open, a bottom unit surrounding the base of the aforesaid column and to which the lower ends of the aforesaid walls are joined and within which are disposed the lower ends of the electrodes and dielectric, said bottom unit having a central opening that receives the lower end of the column and the unit comprising an enclosing wall from which the lower ends of the electrodes are spaced, thereby to provide by reason of such spacing communication between the spaces on the'opposite sides of each electrode, a cap enclosing and spaced from the header and having its lower end joined to the aforesaid outer wall, means securing said cap to the top of the column, means for admitting air to the space enclosed by the outer wall and cap, the aforesaid header having an outlet leading from the ozone passage thereof, a partition surrounding the column and extending therefrom tofthe aforesaid inner wall intermediate the ends of the latter so as to separate the interior of said innervwall into a cool air space above said partition and a warm air space below the partition, said inner wall being apertured below the partition, a cool air port in said column above said partition, a warm air port in said column below the partition, a thermostatic element supported within the column, and shutter means operatively connected thereto for controlling the passage of air through said ports.

7. An ozone generator structure comprising a hollow vertically disposed column, an inner tubular electrode, an outer tubular electrode, and an interposed tubular dielectric, said electrodes and dielectric surrounding the column and being arranged in substantially concentric spaced relation to one another and to said column, an outer wall surrounding and slightly spaced from the outer electrode, an inner wall similarly spaced from the inner electrode, a header to which' the upper ends of the electrodes are joined and into which the upper end of the dielectric projects, the header enclosing an ozone passage into which the spaces on the opposite sides of the dielectric open, a bottom unit surrounding the base of the aforesaid column and to which the lower ends of the aforesaid walls are joined and within which are disposed the lower ends of the electrodes and dielectric, said bottom unit having a central opening that receives the lower end of the column and the unit comprising an enclosing wall from which the lower ends of the electrodes are spaced, thereby to provide by reason of such spacing communication between the spaces on the opposite sides of each electrode, a cap enclosing and spaced from the header and having its lower end joined to the aforesaid outer wall, means securing said cap to the top of the column, means for admitting i below the partition, a cool air port in said column above said partition, a warmY air port in said column below the partition, a bi-metal strip, a

cross bar in the column to which oneend of said strip issecured, the aforesaid ports being on opposite sides of the column, and shutters lsecured tothe opposite sides of said strip for cooperation with said ports.

8. In an ozone generator, an inner tubular electrode, an outer tubular electrode, an interposed tubular dielectric, and a tubular casing. d

wall surrounding the outer electrode, all of the foregoing elements being arranged in substantially concentric, spaced relation to one another, a bottom unit applied to the lower end of the casing wall, said bottom unit including an uuwardly opening annular channel into which the lower end of the dielectric extends, the lower edge of the casing wall engaging the outer wall of the channel, seats spaced apart about the inner and outer walls of the channel for supporting the electrodes with their lower ends adjacent the top of the channel, a header in the form of a downwardly opening channel tted to the upper ends of the inner and outer electrodes and into which the corresponding end of the dielectric extends, a cap enclosing said header and applied to the upper end of the casing wall, the header having an outlet for ozonized fluid, means binding the cap to the bottom unit to thereby clamp between the cap and unit the casing wall, with the electrodes, header and dielectric held in operative relation to one another, and means for admitting air to the space enclosed by the casing wall, cap and bottom unit.

9. An ozone generator according to claim 8, wherein the cap includes a top wall and a peripheral wall, and means are provided for spacing the header from said walls of the cap.

10. In an ozone generator, an inner tubular electrode, an outer tubular electrode, an interposed tubular dielectric, and a tubular casing wall surrounding the outer electrode, all of the foregoing elements being arranged in substantially concentric, spaced relation to one another, a bottom unit applied lto the lower end of the casing wall, said bottom unit including an upwardly opening annular channel into which the lower end of the dielectric extends to substantially the bottom of the channel, the lower edge of the casing wall engaging the outer wall of the channel, seats spaced apart about the inner and outer walls of the channel for supporting the electrodes with their lower ends adjacent the top of the channel and in spaced relation to the sides thereof, a header in the form of a downwardly opening channel tted to the upper ends of the inner and outer electrodes and into which the corresponding end of the dielectric extends, a cap enclosing said header in spaced relation thereto and applied to the upper end of the casing wall, the header having an outlet extension, and the cap having an aperture through which said extension projects, means binding the cap to the bottom unit to thereby clamp between the cap and unit the casing wall, with the elec- `:10 trodes; header andjydielectric held in operative relation to oneanother, and means for admitting air .to the spaceenclosed by the casing wall, cap and bottom unit. Y

11. In an ozonegenerator, an innerV tubular electrode, an outer vtubular electrode, `ari-interposed tubular dielectric, and a tubular casing wall surrounding theouter electrode, all of the foregoing elementsv being arranged in substantially concentric, spaced relation to one another, a bottom unit applied to the lower end of the casing wall, said unit including an upwardly opening annular channel into which the lower end ofthe dielectric extends a substantial'distance, the lower edge of the casing wall engaging the .outer wall of the channel, seats spaced apart about the inner and outer walls of the channel Yfor supporting the electrodes with their-lower ends adjacent the top of the channel and in spaced relation to the sides thereof, a header in the form of a downwardly opening channel fitted to the upper ends of the inner and outer electrodes and into which the corresponding end of the dielectric extends, a cap enclosing said header and applied to the upper end of the casing wall, the header having a fluid outlet, an elongated element extending axially of the inner electrode and to the opposite ends of which the bottom unit and cap are secured, the casing wall ybeing clamped between the cap and unit with the enclosed electrodes, dielectric and header held in operative relation to one another, and means for admitting air to the space enclosed by the casing wall, cap and bottom unit.

12'. In an ozone generator, an inner tubular electrode, an outertubular electrode, an interposed tubular dielectric, and a tubular .casing wall surrounding the outer electrode, all of the foregoing elements being arranged in substantially concentric, spaced relation to one another, a bottom unit applied to the lower end of the casing wall, said bottom unit including an upwardly opening annular channel into which the lower end of the dielectric extends, the lower edge of the casing wall engaging the outer wall of the channel, seats spaced apart about the inner and outer walls of the channel for supporting the electrodes with their lower ends adjacent the top of the channel and in spaced relation to the sides thereof, a header in the form of a downwardly opening channel fitted to the upper ends of the inner and outer electrodes and into which the corresponding end of the dielectric extends, a cap enclosing said header in spaced relation thereto and applied to the upper end of the casing Wall, the header having an outlet for the ozonized fluid, and means binding the cap to the bottom unit to thereby clamp between the cap and unit the casing wall, with the electrodes, header and dielectric held in operative relation to one another, the casing wall having an opening for admitting air to the space enclosed by the casing wall, cap and bottom unit.

13. In an ozone generator, an inner tubular electrode, an outer tubular electrode, an interposed tubular dielectric, and a tubular casing Wall surrounding the outer electrode, all of the foregoing elements being arranged in substantially concentric, spaced relation to one another, a bottom unit applied to the lower end of the casing wall. saidv unit including an upwardly opening annular channel into which the lower end of the dielectric extends, the lower edge of the casing wall engaging the outer wall of the channel. seats spaced apart about the inner and outer walls of the channel for supporting the electrodes with their lowere'nds adjacent the top of the channel and in spaced relation to the sides thereof, a header in the .form of a downwardly opening channel tted to the upper end s of the inner and outer electrodes and into which the corresponding end of the dielectric extends, a cap enclosing said header and applied tothe upper end of the casing wall, the header having an outlet for ozonized fluid, a hollow column disposed axially of the inner electrode and to the upper and lower ends of which the cap and bottom unit are, respectively, secured, the bottom unit having an aperture through which the lower end of the column projects', the column being apertured for the entrance of air thereto intermediate the cap and bottom unit. and means for admitting air to the space enclosed by the casing wall, cap and bottom unit.

LEE s. CHADWICK. 20

REFERENCES CITED The following references are of record in the le of this patent:

5 UNITED STATES PATENTS Number Name Date 909,309 Kolle Jan. 12, 1909 919,403 Vosmaer Apr. 27, 1909 1,050,260 Walden Jan. 14, 1913 10 1,312,484 Knox et al. Aug. 5, 1919 1,505,752 Todd Aug. 19, 1924 1,965,766 Hartmann July 10, 1934 FOREIGN PATENTS 15 Number Country Date 156,531 Germany Nov. 21, 1904 

1. AN OZONE GENERATOR STRUCTURE COMPRISING AN INNER TUBULAR ELECTRODE, AN OUTER TUBULAR ELECTRODE, AND AND INTERPOSED TUBULAR DIELECTRIC, ALL ARRANGED IN SUBSTANTIALLY CONCENTRIC, SPACED RELATION TO ONE ANOTHER, AN OUTER WALL SURROUNDING AND SLIGHTLY SPACED FROM THE OUTER ELECTRODE, A TUBULAR INNER WALL SIMILARLY SPACED FROM THE INNER ELECTRODE, A HEADER TO WHICH THE UPPER ENDS OF THE ELECTRODES ARE JOINED AND INTO WHICH THE UPPER END OF THE DIELECTRIC PROJECTS, THE HEADER ENCLOSING AN OZONE PASSAGE INTO WHICH THE SPACES ON THE OPPOSITE SIDES OF THE DIELECTRIC OPEN, A HOLLOW BOTTOM UNIT TO WHICH THE LOWER ENDS OF THE AFORESAID WALLS ARE JOINED AND WITHIN WHICH ARE DISPOSED THE LOWER ENDS OF THE ELEC- 